Loans, Impaired Loans and Allowance for Credit Losses - Additional Information (Detail) - CAD ($) $ in Millions |
3 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
Apr. 30, 2026 |
Apr. 30, 2026 |
Jan. 31, 2026 |
Oct. 31, 2025 |
|
| CANADA | ||||
| Disclosure of detailed information about financial instruments [line items] | ||||
| Percentage of imposed import tariffs by US | 7.50% | |||
| Base case scenario [member] | ||||
| Disclosure of detailed information about financial instruments [line items] | ||||
| ACL (Stage 1 and Stage 2) | $ 4,936 | $ 4,898 | $ 5,313 | |
| Base case scenario [member] | Previously stated [member] | ||||
| Disclosure of detailed information about financial instruments [line items] | ||||
| ACL (Stage 1 and Stage 2) | 4,644 | 4,598 | 5,018 | |
| Pessimistic scenario [member] | ||||
| Disclosure of detailed information about financial instruments [line items] | ||||
| ACL (Stage 1 and Stage 2) | $ 591 | 607 | 786 | |
| Probability Weighted Scenarios [Member] | ||||
| Disclosure of detailed information about financial instruments [line items] | ||||
| ACL (Stage 1 and Stage 2) | $ 807 | $ 753 | $ 801 | |